We're going to be swimming in circles here. I know two gentlemen with more than 40 years' experience with Coticules. I am a member of two forums with hundreds of people who use them successfully. This forum is focussed on hones, synthetics in particular. There are many good reasons to use them, most notably their predictability. However, your refusal to accept that many people get perfect edges off of Coticules strikes me as somewhat counter intuitive.

Craftsmen, tools, and all that...